Estimating minimum detectable concentrations achievable while scanning building surfaces and land areas

Area of Science:

• Radiological survey methods
• Radiation detection and measurement
• Environmental monitoring

Background:

• Radiological surveys are crucial for identifying elevated direct radiation levels.
• Detected radiation levels are influenced by surveyor capabilities and decision-making.
• Accurate assessment of minimum detectable concentrations (MDCs) is vital for effective surveys.

Purpose of the Study:

• To develop a method for anticipating detectable radiation levels during scanning.
• To account for human efficiency limitations in survey instrument readings.
• To refine calculations for minimum detectable concentrations (MDCs) in practical scanning scenarios.

Main Methods:

• Estimating the required increment in a survey instrument's counting rate.
• Incorporating Type I and Type II error rate limits into calculations.
• Applying the method to determine scan MDCs for surfaces and land areas.

Main Results:

• A novel approach to anticipate surveyor-detectable radiation levels.
• Improved MDC calculations that consider human performance factors.
• Practical examples for common radionuclides and field instrumentation.

Conclusions:

• The described method enhances the reliability of radiological survey results.
• It provides a more realistic estimation of MDCs achievable during scanning.
• This approach supports more effective environmental radiation monitoring and assessment.